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Campbell CS616 Features

High accuracy and precision water content reflectometer, designed for long-term monitoring
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Download this manual See also: Instruction Manual, User Manual

Overview

The CS616 measures the volumetric water content (VWC) of
porous media (such as soil) from 0% to saturation. The probe

Benefits and Features

Compatible with most Campbell Scientific dataloggers*
High accuracy and high precision
Fast response time
Designed for long-term unattended water content monitoring

Technical Description

The CS616 is comprised of two 30 cm-long stainless steel rods
connected to the measurement electronics. The circuit board is
encapsulated in epoxy, and a shielded four-conductor cable is
connected to the circuit board to supply power, enable probe,
and monitor the output.
The CS616 uses the time-domain measurement method to
measure VWC; a reflectometer (cable tester) such as the TDR100
is not required. This method consists of the CS616 generating an
electromagnetic pulse. The elapsed travel time and pulse reflec-
tion are then measured and used to calculate soil volumetric
water content.
*The CS616 is not compatible with our CR200(X)-series, CR7, or CR9000X dataloggers. However, a similar sensor, the CS625, has been
developed specifically for our CR200(X)-series dataloggers. The operating system of older dataloggers might need to be upgraded. Operating
system upgrades are available, at no charge, from: www.campbellsci.com/downloads
High Accuracy
and Precision
Designed for long-term monitoring
outputs a megahertz oscillation frequency, which is scaled down
and easily read by a Campbell Scientific datalogger.
Compatible with AM16/32-series multiplexers allowing
measurement of multiple sensors
Probe rods can be inserted from the surface or buried at any
orientation to the surface

Response Characteristics

The signal propagating along the parallel rods of the CS616
is attenuated by free ions in the soil solution and conductive
constituents of the soil mineral fraction. In most applications,
the attenuation is not enough to affect the CS616 response to
changing water content, and the response is well described by
the standard calibration. However, in soil with relatively high soil
electrical conductivity levels, compacted soils, or soils with high
clay content, the calibration should be adjusted for the specific
medium. Guidance for making these adjustments is provided in
the operating manual.
questions & quotes: 435.227.9000
www.campbellsci.com/cs616-l
COMPONENTS
CS616
Water Content Reflectometer

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Summary of Contents for Campbell CS616

  • Page 1 *The CS616 is not compatible with our CR200(X)-series, CR7, or CR9000X dataloggers. However, a similar sensor, the CS625, has been developed specifically for our CR200(X)-series dataloggers. The operating system of older dataloggers might need to be upgraded. Operating system upgrades are available, at no charge, from: www.campbellsci.com/downloads...

  • Page 2: Ordering Information

    The RF emissions are below FCC and EU limits as specified in sources can also affect the CS616 operation. Consequently, the EN61326 if the CS616 is enabled less than 0.6 ms, and measure- CS616 should be located away from significant sources of RF ments are made less frequently than once a second.

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